/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.server.master.processor;

import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.dao.entity.TaskDefinition;
import org.apache.dolphinscheduler.remote.command.Command;
import org.apache.dolphinscheduler.remote.command.CommandType;
import org.apache.dolphinscheduler.remote.command.TaskExecuteStartCommand;
import org.apache.dolphinscheduler.remote.processor.NettyRequestProcessor;
import org.apache.dolphinscheduler.server.master.cache.StreamTaskInstanceExecCacheManager;
import org.apache.dolphinscheduler.server.master.runner.StreamTaskExecuteRunnable;
import org.apache.dolphinscheduler.server.master.runner.StreamTaskExecuteThreadPool;
import org.apache.dolphinscheduler.service.process.ProcessService;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.google.common.base.Preconditions;

import io.netty.channel.Channel;

/**
 * task execute start processor, from api to master
 */
@Component
public class TaskExecuteStartProcessor implements NettyRequestProcessor {

  private final Logger logger = LoggerFactory.getLogger(TaskExecuteStartProcessor.class);

  @Autowired
  private StreamTaskExecuteThreadPool streamTaskExecuteThreadPool;

  @Autowired
  private ProcessService processService;

  @Override
  public void process(Channel channel, Command command) {
    Preconditions.checkArgument(CommandType.TASK_EXECUTE_START == command.getType(), String.format("invalid command type : %s", command.getType()));
    TaskExecuteStartCommand taskExecuteStartCommand = JSONUtils.parseObject(command.getBody(), TaskExecuteStartCommand.class);
    logger.info("taskExecuteStartCommand: {}", taskExecuteStartCommand);

    TaskDefinition taskDefinition = processService.findTaskDefinition(taskExecuteStartCommand.getTaskDefinitionCode(), taskExecuteStartCommand.getTaskDefinitionVersion());
    if (taskDefinition == null) {
      logger.error("Task definition can not be found, taskDefinitionCode:{}, taskDefinitionVersion:{}", taskExecuteStartCommand.getTaskDefinitionCode(), taskExecuteStartCommand.getTaskDefinitionVersion());
      return;
    }
    streamTaskExecuteThreadPool.execute(new StreamTaskExecuteRunnable(taskDefinition, taskExecuteStartCommand));

    // response
    Command response = new Command(command.getOpaque());
    response.setType(CommandType.TASK_EXECUTE_START);
    response.setBody(new byte[0]);
    channel.writeAndFlush(response);
  }

}
